Path tracing brokes nanite meshes with 5.1

[Daniel_Mine]

Hello.
Here the same mesh, one has nanite enabled, (the broken one) It’s not about 2sides materials because I can assign every default lit material I want but it doesn’t change anything.

[Daniel_Mine]

Another example. this is broken in another way.
I also attach the nanite settings opening the mesh. The preview is fine, so it’s definitely something wrong about path tracing!!!